Charge transfer in cluster-atom collisions

Molecular view of charge exchange in ion–C60 collisions

“…Also, the large number of nuclear degrees of freedom in C 60 prevents one from obtaining a fully quantum mechanical description of the collision dynamics. To date, a description including all electronic and nuclear degrees of freedom is restricted to small metal clusters, typically containing less than 10 atoms 12, 13.…”

Metalorganic Chemical Vapor Deposition of HfO2Films through the Alternating Supply of Tetrakis(1-methoxy-2-methyl-2-propoxy)-Hafnium and Remote-Plasma Oxygen

“…The cross section then becomes a function of velocity and peaks near the velocity given by the Massey criterion, v ∼ ER c /h. In fact, cross sections for charge-transfer reactions of cluster ions have been found to increase rapidly with collision energy at low ion energies (Rohmund and Campbell 1997, Knospe et al 1999, Tuinmann and Compton 2002. Electron transfer from Na is also an efficient way to produce a weakly bound or even an unbound dianion.…”

Charge Transfer and Dissociation in Collisions of Metal Clusters with Atoms

“…As a consequence, rigorous attempts to confront theory and experiment at a quantitative level are very scarce. One of these attempts has been the study of CT in Na 9 Cs collisions [8][9][10][11][12], for which the theory [11] has provided absolute CT cross sections in good agreement with those deduced from experiment [8].…”

“…Thus, a direct comparison between theory and experiment is possible only for the relative intensities of the cluster fragments (the observables). As the theoretical work on Na 9 Cs [12] has shown, this comparison is not straightforward. The latter work suggests that evaporation cross sections critically depend on the initial cluster temperature T and the experimental time-of-flight (TOF) window e .…”

“…[7,12]. This method has been previously used to study CT and fragmentation in Na 9 Cs collisions. Our method benefits from the different time scales associated with the collision and the internal motion of the cluster nuclei: in the first place, because the collision time ( col 10 ÿ14 s) is much shorter than the cluster vibrational period ( v 10 ÿ12 s) in the range of impact velocities considered in this work (v 0:01-0:03 au); in the second place, because the electron-phonon coupling responsible for the observed dissociation has a characteristic lifetime of rel 10 ÿ13 -10 ÿ12 s and, therefore, can be ignored during the collision.…”